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    <div class="container-fluid">
        <div class="jumbotron">
            <h1>第一个Bootstrap</h1>
            <p>booasidkjashdkajsdh</p>
            <p>dahbsdhasbda</p>
        </div>
        <div class="row">
            <div class="col-sm-4 bg-info">
                <h3 class="text-sucess">第一列</h3>
                <p>这是第一列内容</p>
            </div>
            <div class="col-sm-4 bg-primary">
                    <h3 class="text-muted">第二列</h3>
                    <p>这是第二列内容</p>
                </div>
                <div class="col-sm-4 bg-danger">                  
                        <h3 class="text-info">第三列</h3>
                        <p>这是第三列内容</p>
                    </div>
        </div>
        <div class="container-fluid mt-5">
            <div class="row">
                <div class="col-md-4 bg-info"> 1</div>
                <div class="col-md-4 offset-md-4 bg-warning"> 2</div><!---->
            </div>
            <div class="row">
                <div class="col-md-5 offset-md-1 bg-success"> 3</div>
                <div class="col-md-3 offset-md-3 bg-warning"> 4</div><!---->
            </div>
            <div class="row">
                <div class="col-md-5 offset-md-3 bg-info"> 5</div><!---->
            </div>
        </div>
    </div>
</body>
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